Pressure adjusting mechanism for LNG (Liquefied Natural Gas) tank

Abstract

The invention provides an LNG tank pressure regulating mechanism which comprises an LNG tank body, a first partition plate is fixedly mounted in the LNG tank body, and the first partition plate divides the interior of the LNG tank body into a pressure relief cavity and a storage cavity; a communicating groove is formed in the first partition plate, a fixing pipe is arranged in the communicating groove, a plurality of evenly-distributed pressure relief holes are formed in the side wall of the fixing pipe, the end, close to the storage cavity, of the fixing pipe is open, the other end of the fixing pipe is closed, an elastic assembly and a sealing gasket are arranged in the fixing pipe, and one end of the elastic assembly is connected with a sealing piece; the sealing piece is driven by the elastic force of the elastic assembly to abut against the sealing gasket in a sealed mode. When the pressure in the storage cavity reaches a dangerous value, the pressure pushes the sealing piece to leave the sealing gasket and extrudes the elastic assembly, so that the natural gas in the storage cavity part enters the fixed pipe and enters the pressure relief cavity through the plurality of uniformly distributed pressure relief holes, the pressure in the storage cavity is reduced, and safety accidents caused by overlarge pressure in the storage cavity are avoided.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of pressure vessels, and in particular to a pressure regulating mechanism for an LNG gas tank. Background Art

[0002] LNG tanks, as professional Class III pressure vessels for storing liquefied natural gas, are mainly made of special materials such as 06Ni9DR, and have good low-temperature toughness and corrosion resistance. Its structure is diverse, including vertical, horizontal, mother-child tanks and atmospheric pressure tanks, with specifications ranging from tens of cubic meters to hundreds of cubic meters to meet various storage needs. The manufacturing process of LNG tanks is strict, and it needs to go through processes such as flaw detection, water pressure and air pressure testing, and on-site inspection by the Technical Supervision Bureau, and issue a pressure vessel inspection certificate to ensure its quality and safety. With the increasing global demand for clean energy, LNG tanks are increasingly used in natural gas filling stations, liquefied natural gas transportation and industrial production. At the same time, with the continuous advancement of technology, the manufacturing process and material performance of LNG tanks are also constantly improving to meet higher standards of safety and reliability requirements. Therefore, the market demand for LNG tanks continues to grow, showing broad development prospects.

[0003] LNG needs to be stored under a certain pressure to ensure that it is in a liquid state and maintains the stability of its physical and chemical properties. Appropriate pressure can prevent LNG from gasifying due to increased temperature or reduced pressure. Therefore, it is necessary to prevent excessive internal pressure in the LNG tank from causing safety accidents, and to avoid excessive internal pressure in the LNG tank from affecting the stability of LNG. LNG tanks usually have a preset pressure value, but when the LNG tank is being transported, the internal shaking will increase the pressure value, and the pressure can only be released manually through a pressure relief valve. However, manual adjustment is not real-time and can easily lead to safety accidents. Summary of the invention

[0004] 1. Technical problem to be solved by the invention: The present invention provides an LNG gas tank pressure regulating mechanism to solve the technical problems existing in the above-mentioned background technology.

[0005] 2. Technical solution: To achieve the above-mentioned purpose, the technical solution provided by the present invention is: an LNG gas tank pressure regulating mechanism, comprising an LNG gas tank body, wherein a first partition is fixedly installed in the LNG gas tank body, and the first partition divides the LNG gas tank body into a pressure relief chamber and a storage chamber; A connecting groove is provided on the first partition plate, a fixed tube is provided in the connecting groove, a plurality of evenly distributed pressure relief holes are provided on the side wall of the fixed tube, one end close to the storage chamber is open, and the other end is closed, an elastic component and a sealing gasket are provided in the fixed tube, one end of the elastic component is connected to a sealing member, and the sealing member is sealed against the sealing gasket under the drive of the elastic force of the elastic component.

[0006] Furthermore, the elastic component includes a fixedly installed guide sliding rod, on which a first connecting sleeve is fixedly installed, and a second connecting sleeve and a third connecting sleeve are slidably installed, the end of the second connecting sleeve is connected to the seal, the third connecting sleeve is in multiple numbers and is located between the first connecting sleeve and the second connecting sleeve, and a plurality of springs are also provided on the guide sliding rod, and the plurality of springs are respectively located between two adjacent connecting sleeves.

[0007] Furthermore, two adjacent connecting sleeves are hingedly connected via a first connecting rod, both sides of the second connecting sleeve are hingedly connected to a second connecting rod, the other end of the second connecting rod is hingedly connected to a movable rod, a sealing plug is fixedly installed at the end of the movable rod, and the sealing plug is sealingly and slidably connected to the pressure relief hole.

[0008] Furthermore, a sealing ring is provided at the end of the sealing member, and the sealing rings are multiple and coaxially distributed, and the multiple sealing rings are respectively sealed and matched with multiple annular grooves opened at the end of the sealing gasket.

[0009] Furthermore, a baffle is provided in the storage cavity, and the baffle is multiple in number and evenly distributed along the axial direction of the storage cavity.

[0010] Furthermore, the baffle is provided with a plurality of evenly distributed through holes.

[0011] Furthermore, the baffle side walls are fixedly mounted with a plurality of evenly distributed sliders, the sliders are slidably connected to the slide rails arranged on the inner walls of the storage chamber, the extension direction of the slide rails is the same as the axial direction of the storage chamber, and connecting rods are arranged at both ends of the inner walls, the connecting rods are slidably connected to the sliding grooves opened at the ends of the sliders, a piston member is fixedly mounted on the ends of the connecting rods, the piston member is sealingly and slidably connected to the movable grooves opened inside the sliders, a second partition is arranged in the movable groove, and the second partition is located between the two piston members.

[0012] 3. Beneficial effects: The technical solution provided by the present invention has the following beneficial effects compared with the prior art: when the pressure in the storage chamber reaches a dangerous value, the pressure will push the seal away from the sealing gasket and squeeze the elastic component, so that the natural gas in the storage chamber will enter the fixed pipe and enter the pressure relief chamber through a plurality of evenly distributed pressure relief holes, thereby reducing the pressure in the storage chamber. Similarly, when the pressure in the storage chamber returns to normal, the elastic component will push the seal again to seal against the sealing gasket, thereby isolating the pressure relief chamber from the storage chamber, thereby realizing automatic real-time adjustment of the pressure in the storage chamber, avoiding safety accidents caused by excessive pressure in the storage chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of the LNG gas tank body of the present invention after being made transparent; Figure 2 It is a schematic diagram of the overall cutaway structure of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the slider and the slide rail of the present invention; Figure 4 It is a schematic diagram of the cross-section structure of the fixed pipe of the present invention; Figure 5 It is a schematic diagram of the structure of the sealing member and the sealing gasket of the present invention; Figure 6 For the present invention Figure 4 Enlarged structural diagram at A in the middle.

[0014] Reference numerals: 1. LNG tank body; 101. Pressure relief chamber; 102. Storage chamber; 2. First partition; 21. Connecting groove; 3. Fixed pipe; 31. Pressure relief hole; 4. Elastic component; 41. Guide slide rod; 42. First connecting sleeve; 43. Second connecting sleeve; 44. Third connecting sleeve; 45. Spring; 5. Seal; 51. Sealing ring; 6. Sealing pad; 61. Annular groove; 7. First connecting rod; 8. Second connecting rod; 9. Movable rod; 10. Sealing plug; 11. Baffle; 111. Through hole; 12. Slider; 121. Movable groove; 122. Sliding groove; 13. Slide rail; 14. Piston; 15. Connecting rod; 16. Second partition. DETAILED DESCRIPTION

[0015] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0016] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "page", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0017] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0018] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", "provided with", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0019] Refer to the attached Figure 1-6 , an LNG gas tank pressure regulating mechanism, comprising an LNG gas tank body 1, wherein a first partition plate 2 is fixedly installed in the LNG gas tank body 1, and the first partition plate 2 divides the LNG gas tank body 1 into a pressure relief chamber 101 and a storage chamber 102; A connecting groove 21 is provided on the first partition plate 2, and a fixing tube 3 is provided in the connecting groove 21. A plurality of evenly distributed pressure relief holes 31 are provided on the side wall of the fixing tube 3, and one end close to the storage chamber 102 is open, while the other end is closed. An elastic component 4 and a sealing gasket 6 are provided in the fixing tube 3, and a sealing member 5 is connected to one end of the elastic component 4, and the sealing member 5 is sealed against the sealing gasket 6 under the elastic force of the elastic component 4.

[0020] In this embodiment, the LNG tank body 1 is divided into a pressure relief chamber 101 and a storage chamber 102 by a first partition plate 2, wherein the storage chamber 102 is used to store natural gas. The natural gas becomes liquid under the pressure in the storage chamber 102. When the pressure in the storage chamber 102 is normal, the elastic component 4 will push the seal 5 to seal against the gasket 6. During transportation, the natural gas liquid will sway back and forth in the storage chamber 102, so that the natural gas molecules collide with each other and expand, which will increase the pressure in the storage chamber 102. When the pressure reaches a dangerous value, It will push the seal 5 away from the sealing gasket 6 and squeeze the elastic component 4, so that part of the natural gas in the storage chamber 102 will enter the fixed pipe 3 and enter the pressure relief chamber 101 through a plurality of evenly distributed pressure relief holes 31, thereby reducing the pressure in the storage chamber 102. Similarly, when the pressure in the storage chamber 102 returns to normal, the elastic component 4 will push the seal 5 again to seal against the sealing gasket 6, thereby isolating the pressure relief chamber 101 from the storage chamber 102, and realizing automatic real-time adjustment of the pressure in the storage chamber 102 to avoid safety accidents caused by excessive pressure in the storage chamber 102.

[0021] The elastic component 4 includes a fixedly mounted guide slide rod 41, on which a first connecting sleeve 42 is fixedly mounted, and a second connecting sleeve 43 and a third connecting sleeve 44 are slidably mounted, wherein the end of the second connecting sleeve 43 is connected to the sealing member 5, and the third connecting sleeve 44 is in a plurality and is located between the first connecting sleeve 42 and the second connecting sleeve 43. A plurality of springs 45 are also provided on the guide slide rod 41, and the plurality of springs 45 are respectively located between two adjacent connecting sleeves.

[0022] In this embodiment, when the pressure pushes the seal 5 to leave the sealing gasket 6, the second connecting sleeve 43 will slide on the guide slide rod 41 and squeeze the spring 45 connected to it, and push the nearest third connecting sleeve 44 to slide on the guide slide rod 41 through the deformation of the spring 45, and the same process will be carried out in sequence until the last spring 45 is deformed and pushes the first connecting sleeve 42, so that the elastic force of multiple springs 45 can be superimposed, and the overall elasticity can be improved in a limited space to ensure that the push seal 5 can be sealed and abutted against the sealing gasket 6 when there is a predetermined pressure in the storage chamber 102.

[0023] The two adjacent connecting sleeves are hingedly connected via a first connecting rod 7, and the second connecting sleeve 43 is hingedly connected to the second connecting rod 8 on both sides, and the other end of the second connecting rod 8 is hingedly connected to a movable rod 9, and a sealing plug 10 is fixedly installed at the end of the movable rod 9, and the sealing plug 10 is sealed and slidably connected to the pressure relief hole 31.

[0024] In this embodiment, when the third connecting sleeve 44 slides on the guide slide rod 41 under high pressure, the second connecting rod 8 will pull the movable rod 9 to make the sealing plug 10 slide and connect in the pressure relief hole 31. When the sealing plug 10 leaves the pressure relief hole 31, the pressure can enter the pressure relief chamber 101 through the pressure relief hole 31, and the two adjacent connecting sleeves are hingedly connected by the first connecting rod 7, and then cooperate with multiple springs 45, so the second connecting sleeve 43 and multiple third connecting sleeves 44 will be on the guide slide rod 41 in turn, that is, multiple pressure relief holes 31 will be opened in turn, so as the pressure relief proceeds, the number of opened pressure relief holes 31 increases, thereby increasing the pressure relief speed, and can avoid the pressure relief holes 31 from opening at the same time, causing pressure imbalance in the pressure relief chamber 101 and the storage chamber 102.

[0025] The sealing member 5 is provided with a sealing ring 51 at the end thereof. The sealing rings 51 are multiple and coaxially distributed. The multiple sealing rings 51 are respectively sealed and matched with multiple annular grooves 61 opened at the end of the sealing gasket 6 .

[0026] In this embodiment, the sealing member 5 and the sealing gasket 6 can be matched to perform initial sealing, and then a plurality of sealing rings 51 and a plurality of annular grooves 61 can be matched to perform safety sealing, thereby improving the overall sealing effect.

[0027] A baffle 11 is provided in the storage chamber 102. There are multiple baffles 11, which are evenly distributed along the axial direction of the storage chamber 102. The natural gas liquid in the storage chamber 102 can be divided into multiple portions. When there is a violent shake during transportation, the shaking force can be greatly reduced, thereby avoiding the extremely excessive pressure in the storage chamber 102 caused by the shaking. In addition, a plurality of evenly distributed through holes 111 are opened on the baffle 11 to ensure the circulation of the natural gas liquid in the storage chamber 102 and reduce the difficulty of natural gas filling and discharge.

[0028] A plurality of evenly distributed sliders 12 are fixedly mounted on the side wall of the baffle 11, and the sliders 12 are slidably connected to the slide rails 13 arranged on the inner wall of the storage chamber 102, and the extension direction of the slide rails 13 is the same as the axial direction of the storage chamber 102, and connecting rods 15 are arranged at both ends of the inner wall, and the connecting rods 15 are slidably connected to the sliding grooves 122 opened at the ends of the sliders 12, and a piston member 14 is fixedly mounted on the ends of the connecting rods 15, and the piston member 14 is sealingly and slidably connected to the movable groove 121 opened inside the slider 12, and a second partition plate 16 is arranged in the movable groove 121, and the second partition plate 16 is located between the two piston members 14.

[0029] In this embodiment, when the natural gas liquid in the storage chamber 102 is shaken during transportation, the natural gas liquid will hit the baffle 11, and the baffle 11 will slide in the slide rail 13 through the slider 12 when hit, and the connecting rod 15 will slide in the sliding groove 122 at the same time, so that the piston member 14 can synchronously slide in the movable groove 121 in a sealed manner, and the movable groove 121 can be isolated and formed into a sealed cavity through the second partition plate 16, so when the piston member 14 slides in the movable groove 121 in a sealed manner, it will move slowly under the influence of air pressure, so the baffle 11 will also move slowly, thereby being able to buffer the natural gas liquid.

[0030] The above-described embodiments only express a certain implementation mode of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

[0031] It should be noted that the above contents belong to the technical cognition scope of the inventor. Since the technical contents in this field are vast and too complicated, the above contents of this application do not necessarily constitute prior art.

Claims

1. A LNG tank pressure regulating mechanism, Features: It comprises an LNG gas tank body (1), wherein a first partition plate (2) is fixedly installed in the LNG gas tank body (1), and the first partition plate (2) divides the LNG gas tank body (1) into a pressure relief chamber (101) and a storage chamber (102); The first partition plate (2) is provided with a connecting groove (21), a fixing tube (3) is arranged in the connecting groove (21), a plurality of evenly distributed pressure relief holes (31) are arranged on the side wall of the fixing tube (3), one end close to the storage chamber (102) is open, and the other end is closed, an elastic component (4) and a sealing gasket (6) are arranged in the fixing tube (3), one end of the elastic component (4) is connected to a sealing member (5), and the sealing member (5) is in sealing contact with the sealing gasket (6) under the elastic force of the elastic component (4).

2. The LNG tank pressure regulating mechanism according to claim 1, Features: The elastic component (4) comprises a fixedly mounted guide slide rod (41), a first connecting sleeve (42) being fixedly mounted on the guide slide rod (41), and a second connecting sleeve (43) and a third connecting sleeve (44) being slidably mounted, the end of the second connecting sleeve (43) being connected to the sealing member (5), a plurality of third connecting sleeves (44) being located between the first connecting sleeve (42) and the second connecting sleeve (43), and a plurality of springs (45) being arranged on the guide slide rod (41), the plurality of springs (45) being located respectively between two adjacent connecting sleeves.

3. The LNG tank pressure regulating mechanism according to claim 2, Features: Two adjacent connecting sleeves are hingedly connected via a first connecting rod (7), and both sides of the second connecting sleeve (43) are hingedly connected to second connecting rods (8), and the other end of the second connecting rod (8) is hingedly connected to a movable rod (9), and a sealing plug (10) is fixedly installed at the end of the movable rod (9), and the sealing plug (10) is sealingly and slidably connected to the pressure relief hole (31).

4. The LNG tank pressure regulating mechanism according to claim 1, Features: The end of the sealing member (5) is provided with a sealing ring (51), the sealing rings (51) are multiple in number and coaxially distributed, and the multiple sealing rings (51) are respectively sealed and matched with multiple annular grooves (61) provided at the end of the sealing gasket (6).

5. The LNG tank pressure regulating mechanism according to claim 1, Features: A baffle (11) is provided in the storage cavity (102); the baffles (11) are multiple in number and are evenly distributed along the axial direction of the storage cavity (102).

6. The LNG tank pressure regulating mechanism according to claim 5, Features: The baffle (11) is provided with a plurality of evenly distributed through holes (111).

7. The LNG tank pressure regulating mechanism according to claim 5, Features: A plurality of evenly distributed sliders (12) are fixedly mounted on the side wall of the baffle (11); the sliders (12) are slidably connected to a slide rail (13) provided on the inner wall of the storage chamber (102); the slide rail (13) extends in the same direction as the axial direction of the storage chamber (102); connecting rods (15) are provided at both ends of the inner wall; the connecting rods (15) are slidably connected to a slide groove (122) provided at the end of the slider (12); a piston member (14) is fixedly mounted on the end of the connecting rod (15); the piston member (14) is sealingly slidably connected to a movable groove (121) provided inside the slider (12); a second partition plate (16) is provided in the movable groove (121); the second partition plate (16) is located between the two piston members (14).

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